STS

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STS

(Synchronous Transport Signal) The electrical equivalent of the SONET optical signal. In SDH, the European counterpart of SONET, STS is known as STM (Synchronous Transport Module). The signal begins in electrical format and is converted to optical for transmission over the SONET fiber facilities. An STS-1 frame is transmitted in 125ms, yielding raw bandwidth of 51.84 Mbps. The STS frame includes five elements: Synchronous Payload Envelope, Section Overhead, Line Overhead, Path Overhead, and Payload.

The STS-1 frame is the basic building block for SONET, much like the DS1 frame in a T-carrier environment. See OC and SONET.
References in periodicals archive ?
Eight HIV-positive patients (17%) and 9 HIV-negative patients (7.8%) who were M-PCR-TP positive were negative by both serological tests for syphilis. There was no significant difference in the geometric mean titres of the RPR test when comparing HIV-seropositive and -seronegative patients with a positive RPR test (1:13.7 v.
Other factors responsible for the increase in cases of congenital syphilis include failure to perform serological tests for syphilis, treatment failures with the use of benzathine penicillin G in neurosyphilis and during pregnancy, and maternal reinfection.[6,7]